Add test for #618, which was fixed in htmlparser2.
Add test for #618, which was fixed in htmlparser2.

Closes #618.

jeffcarp/jsdom,AshCoolman/jsdom,crealogix/jsdom,fiftin/jsdom,janusnic/jsdom,vestineo/jsdom,snuggs/jsdom,nicolashenry/jsdom,kesla/jsdom,tmpvar/jsdom,selam/jsdom,sirbrillig/jsdom,sebmck/jsdom,robertknight/jsdom,susaing/jsdom,evanlucas/jsdom,evdevgit/jsdom,beni55/jsdom,szarouski/jsdom,AshCoolman/jsdom,nicolashenry/jsdom,mzgol/jsdom,Ye-Yong-Chi/jsdom,vestineo/jsdom,susaing/jsdom,janusnic/jsdom,vestineo/jsdom,mbostock/jsdom,darobin/jsdom,cpojer/jsdom,danieljoppi/jsdom,jeffcarp/jsdom,Ye-Yong-Chi/jsdom,Zirro/jsdom,papandreou/jsdom,medikoo/jsdom,sebmck/jsdom,selam/jsdom,kangax/jsdom,medikoo/jsdom,kittens/jsdom,kesla/jsdom,szarouski/jsdom,snuggs/jsdom,kevinold/jsdom,evanlucas/jsdom,cpojer/jsdom,Ye-Yong-Chi/jsdom,jeffcarp/jsdom,aduyng/jsdom,tmpvar/jsdom,Sebmaster/jsdom,AVGP/jsdom,crealogix/jsdom,beni55/jsdom,dexteryy/jsdom-nogyp,darobin/jsdom,sirbrillig/jsdom,Sebmaster/jsdom,lcstore/jsdom,Joris-van-der-Wel/jsdom,mbostock/jsdom,sirbrillig/jsdom,kesla/jsdom,sebmck/jsdom,robertknight/jsdom,selam/jsdom,kevinold/jsdom,AVGP/jsdom,zaucy/jsdom,papandreou/jsdom,medikoo/jsdom,Joris-van-der-Wel/jsdom,szarouski/jsdom,lcstore/jsdom,darobin/jsdom,susaing/jsdom,lcstore/jsdom,Zirro/jsdom,kittens/jsdom,fiftin/jsdom,Joris-van-der-Wel/jsdom,janusnic/jsdom,mzgol/jsdom,evdevgit/jsdom,kangax/jsdom,aduyng/jsdom,cpojer/jsdom,kittens/jsdom,AshCoolman/jsdom,evanlucas/jsdom,nicolashenry/jsdom,kevinold/jsdom,danieljoppi/jsdom,Sebmaster/jsdom,beni55/jsdom,evdevgit/jsdom,danieljoppi/jsdom,fiftin/jsdom,zaucy/jsdom,aduyng/jsdom,mzgol/jsdom,mbostock/jsdom,zaucy/jsdom,robertknight/jsdom,dexteryy/jsdom-nogyp